旋转式斯特林制冷机单一失效机理的试验方法及寿命预测初探  

Preliminary study on test method and life prediction of single failure mechanism of rotary Stirling cooler

作　　者：李海英[1] 张凯 查云 江重桦[1] 环健[1] 赵文丽 LI Haiying;ZHANG Kai;ZHA Yun;JIANG Chonghua;HUAN Jian;ZHAO Wenli(Kunming Institute of Physics,Kunming 650223,China)

机构地区：[1]昆明物理研究所,云南昆明650223

出　　处：《红外与激光工程》2025年第1期131-136,共6页Infrared and Laser Engineering

摘　　要：旋转式斯特林制冷机作为红外热成像系统的重要组成部分,贮存多年以后其剩余寿命的准确预测对于确保系统的可靠性至关重要。文中基于对斯特林制冷机贮存失效机理的分析,综合考虑制冷机的工作环境、运行状态等因素,提出了分别对应工质污染和工质泄漏失效机理下的加速试验,对使用年限超过十年的样本开展了高温贮存试验和温度循环试验,给出了单一失效机理下的贮存寿命预计模型,深入分析了失效样品的失效原因,并对后续如何开展工作给出了方向。Objective Rotary Stirling coolers are critical components in missile-borne infrared thermal imaging systems.Accurately predicting their remaining life after long-term storage is essential for ensuring missile precision and operational effectiveness.This study aims to develop a reliable method for estimating the remaining life of rotary Stirling coolers that have been in storage for over ten years.Methods Based on an analysis of storage failure mechanisms,the study considered factors such as working environment and operating conditions.Accelerated tests were designed to simulate two primary failure mechanisms:working gas pollution and leakage.Samples with over ten years of application history underwent high-temperature storage tests at 80°C and temperature cycle tests between-55°C and 80°C.Storage life prediction models were established for each failure mechanism.Failure analysis was conducted on samples that failed during testing.Results and Discussions High-temperature storage tests revealed that gas pollution was not the primary cause of failure,as samples did not fail after 5760 hours of accelerated testing(equivalent to 14.2 years under normal conditions).Temperature cycling tests proved more effective in inducing failures.Two samples failed after 330 and 270 cycles,respectively,due to excessive leakage rates(Tab.2).Failure analysis using scanning electron microscopy revealed cracking between the metal substrate and coating layer in one sample(Fig.3),and partial extension and loss of the outer coating layer in another(Fig.4).These findings suggest that temperature cycling has a more significant impact on cooler storage life than gas pollution.A prediction model based on the Norris-Landzberg equation was proposed for estimating remaining life under temperature cycling conditions.Conclusions This study provides valuable insights into the long-term storage behavior of rotary Stirling coolers.While working gas pollution appears to have a slower impact on storage life,gas leakage induced by temperature cycling

关 键 词：旋转式斯特林制冷机 工质污染 工作泄漏 加速试验 预计模型 

分 类 号：TN216[电子电信—物理电子学]